I've seen this when updating systems, but it seems like something is wrong with the handling of nss-certs.
I'm on a guix revision with nss-certs by default, and when I add nss-certs to my system packages (to simulate not removing it when upgrading), it breaks certificates (e.g. wget https://guix.gnu.org/ doesn't work). My reading of the operating-system-packages code suggests that adding nss-certs shouldn't have any effect, but this doesn't seem to be working.
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